- * A visit* method is called when a constant pool entry is parsed.
- * The first argument is always the constant pool index.
- * The second argument is always the constant pool tag,
- * even for methods like {@link #visitUTF8(int, byte, String)} which only apply to one tag.
- * String arguments refer to Utf8 or NameAndType entries declared elsewhere,
- * and are always accompanied by the indexes of those entries.
- *
- * The order of the calls to the visit* methods is not necessarily related
- * to the order of the entries in the constant pool.
- * If one entry has a reference to another entry, the latter (lower-level)
- * entry will be visited first.
- *
- * The following table shows the relation between constant pool entry
- * types and the corresponding visit* methods:
- *
- *
- * | Tag(s) | Method |
|---|
- *
- * | {@link #CONSTANT_Utf8} |
- * {@link #visitUTF8(int, byte, String)} |
- *
- * | {@link #CONSTANT_Integer}, {@link #CONSTANT_Float},
- * {@link #CONSTANT_Long}, {@link #CONSTANT_Double} |
- * {@link #visitConstantValue(int, byte, Object)} |
- *
- * | {@link #CONSTANT_String}, {@link #CONSTANT_Class} |
- * {@link #visitConstantString(int, byte, String, int)} |
- *
- * | {@link #CONSTANT_NameAndType} |
- * {@link #visitDescriptor(int, byte, String, String, int, int)} |
- *
- * | {@link #CONSTANT_Fieldref},
- * {@link #CONSTANT_Methodref},
- * {@link #CONSTANT_InterfaceMethodref} |
- * {@link #visitMemberRef(int, byte, String, String, String, int, int)} |
- *
- *
- *
- * @see ConstantPoolPatch
- * @author Remi Forax
- * @author jrose
- */
-public class ConstantPoolVisitor {
- /** Called each time an UTF8 constant pool entry is found.
- * @param index the constant pool index
- * @param tag always {@link #CONSTANT_Utf8}
- * @param utf8 string encoded in modified UTF-8 format passed as a {@code String}
- *
- * @see ConstantPoolPatch#putUTF8(int, String)
- */
- public void visitUTF8(int index, byte tag, String utf8) {
- // do nothing
- }
-
- /** Called for each constant pool entry that encodes an integer,
- * a float, a long, or a double.
- * Constant strings and classes are not managed by this method but
- * by {@link #visitConstantString(int, byte, String, int)}.
- *
- * @param index the constant pool index
- * @param tag one of {@link #CONSTANT_Integer},
- * {@link #CONSTANT_Float},
- * {@link #CONSTANT_Long},
- * or {@link #CONSTANT_Double}
- * @param value encoded value
- *
- * @see ConstantPoolPatch#putConstantValue(int, Object)
- */
- public void visitConstantValue(int index, byte tag, Object value) {
- // do nothing
- }
-
- /** Called for each constant pool entry that encodes a string or a class.
- * @param index the constant pool index
- * @param tag one of {@link #CONSTANT_String},
- * {@link #CONSTANT_Class},
- * @param name string body or class name (using dot separator)
- * @param nameIndex the index of the Utf8 string for the name
- *
- * @see ConstantPoolPatch#putConstantValue(int, byte, Object)
- */
- public void visitConstantString(int index, byte tag,
- String name, int nameIndex) {
- // do nothing
- }
-
- /** Called for each constant pool entry that encodes a name and type.
- * @param index the constant pool index
- * @param tag always {@link #CONSTANT_NameAndType}
- * @param memberName a field or method name
- * @param signature the member signature
- * @param memberNameIndex index of the Utf8 string for the member name
- * @param signatureIndex index of the Utf8 string for the signature
- *
- * @see ConstantPoolPatch#putDescriptor(int, String, String)
- */
- public void visitDescriptor(int index, byte tag,
- String memberName, String signature,
- int memberNameIndex, int signatureIndex) {
- // do nothing
- }
-
- /** Called for each constant pool entry that encodes a field or method.
- * @param index the constant pool index
- * @param tag one of {@link #CONSTANT_Fieldref},
- * or {@link #CONSTANT_Methodref},
- * or {@link #CONSTANT_InterfaceMethodref}
- * @param className the class name (using dot separator)
- * @param memberName name of the field or method
- * @param signature the field or method signature
- * @param classNameIndex index of the Utf8 string for the class name
- * @param descriptorIndex index of the NameAndType descriptor constant
- *
- * @see ConstantPoolPatch#putMemberRef(int, byte, String, String, String)
- */
- public void visitMemberRef(int index, byte tag,
- String className, String memberName, String signature,
- int classNameIndex, int descriptorIndex) {
- // do nothing
- }
-
- public static final byte
- CONSTANT_None = 0,
- CONSTANT_Utf8 = 1,
- //CONSTANT_Unicode = 2, /* unused */
- CONSTANT_Integer = 3,
- CONSTANT_Float = 4,
- CONSTANT_Long = 5,
- CONSTANT_Double = 6,
- CONSTANT_Class = 7,
- CONSTANT_String = 8,
- CONSTANT_Fieldref = 9,
- CONSTANT_Methodref = 10,
- CONSTANT_InterfaceMethodref = 11,
- CONSTANT_NameAndType = 12;
-
- private static String[] TAG_NAMES = {
- "Empty",
- "Utf8",
- null, //"Unicode",
- "Integer",
- "Float",
- "Long",
- "Double",
- "Class",
- "String",
- "Fieldref",
- "Methodref",
- "InterfaceMethodref",
- "NameAndType"
- };
-
- public static String tagName(byte tag) {
- String name = null;
- if ((tag & 0xFF) < TAG_NAMES.length)
- name = TAG_NAMES[tag];
- if (name == null)
- name = "Unknown#"+(tag&0xFF);
- return name;
- }
-}